Boiler



NW, E2, 1929, E. KEETHLEY BOILER Filed Sept. 50, 1927 4 INVE OR ATTORNEY Fatented Nov. 12 1929 ERNEST C. KEITHLEY, OF DETROIT, MICHIGAN,

sstenon ro] sens seemnmtsit i COMPANY, on NEW 55033;, n. Y.

' BOILER This invention relates to boilers and particularly to boilers in which one or more furnace walls are equipped with water screens. It has for its purpose the provision of'such a boiler in which a superheater is placed between the water screen and the wall and in which provision is made whereby the degree of superheat can be controlled. Other and more detailed objects of the invention will appear from the following description.

The invention is illustrated in the single sheet of drawings herewith in which Fig. 1 is a side elevation, partly in vertical longitudinal section, of a boiler with the invention applied; Fig. 2 is a fragmentary section on an enlarged scale on line 2-2 of Fig. 1; and Fig. 3 is a fragmentary section on an enlarged scale on line 33 of Fig. 1.

The boiler in which the invention is shown in the drawing is of the so-called horizontal water tube type. Some of these water tubes are visible at 1. They communicate at their two ends with the headers 2 and 3. The major portion of this boiler is hidden by the wall 4: of the setting. 5 is the steam and water drum of the boiler from which the steam is taken off through the pipe 6. The furnace below the boiler is enclosed by front wall 7 rear wall 8, and two lateral walls (only one of which appears at 9, the other being removed in the section).

To illustrate the invention it is shown applied to the wall 9, but it will be obvious from the ensuing description that it may equally well be applied to the other side wall and to the rear wall 8. In practice it will usually be applied to the two side walls only. The screen referred to in the introductory remarks above comprises a series of parallel their upper ends are secured to the upper header 12 and communicate with its interior.

* The lower header 11 communicates with the boiler'space by means of the pipe 13, the

cross box 14 and the nipples 15. The upper header 12 is in communicationwith the boiler throu h the pipe 16, cross-pipe 17, and nip-' ples 1%.

Between the screen tubes 10 ancl tliew2331 1 9 are arranged the superheater tubes 18E These are straight for: the nrajer p rtionof thei-r length but are beat oupward tlfrbugbt-he wail-1 9 attheir 1ower' and u peeend's ana connected 55* to the lower" and upper headers 119 and 20 respectively. Thelower Header 19*receives the steam" from th esteam drum 5 thrbug h the 1 connecting pipe 21-, while the superheated: I steam is taken ofi' from the-upper=header-20- through the connection 22 and carried tbthe]' point of use. 1

At 23 "is shown one of: tlie pu1verized-fuel burners-the flame-horn which travels down ward a-t first and then"toward"the left and et upward'into the fiirna'ce space proper. From.

here'tliehot gases travel'over1tl1e=boi1er sur=ifaces and' finally'oiibthi-Ough' the stack {com I p p nection-QAz At" the present stage of the art of super: heatmg it 1s 'lvery difli'cultbto predict ajcc'ua vrately the degree of superheatywhich will ber.

obtained in' a radiant tyzpe of-s'uperh'eater. It is for this reason?highlyfdesirableto lralvei some means. whereby the degree obtained. when {the boiler issput int'o 's'ervice may be readily corrected'yto vapproxiin'a'te athat- '.,com-: puted in "advance from theoretical consideras .2 tions; A further advantage of' theinventi'on J is that if-a'change inconditionsris made after-- the' boileris put into operation,gsuch,*:-for

ample, 'asa-chan'gein-the character'xofsthed fuel, "which mightentaih a change in ttlie dee 1 gree 1 of superheat-obtained; a suitable adjJustment ca'n readilybe made"tobrin itlre-supere::8 heatback to the, desiredgpoint 1*" The means. Proposed-f" Dbl-1 s." purpose-cone 2 'sist in a'wall; or 1partition -25 placed between. the superheater elements 18'} and thefiwaterw tubes;10 of thesection. This wall is:made r up f-bricks-QS of-firej resisting materialz- It: f

restsupon ledge 27 securedfito the wan- 9;: Evidently the height of the Wall; 25 'W1lllfdlrf rectly afiectthe degree of'superheatobtain 1.. and a variation -in this height; prese it a-F ready rneans for adjustingithefdegre o superheat-.' .If it is found, for example,.'that the superhe-at -is somewhat'too high,- theg'i wall a eb l up al eme el in e :opera im-o t eibeiler a semet me .gl

1 which tends to raise the degree of superheat, the wall can also be raised. On the other hand if the degree of superheat is too low, the wall can be partially removed.

5 In the form shown the wall covers. the lower portion of the superheater and this will generally be the most convenient place to install it, but it will be obvious that if desired this wall can readily be secured be- 10 tween the water tubes and the superheater tubes over some other area, for instance, nearer the top or only near the frontor only 7 7 near the'rear of the furnace. Such a variation is 'consideed to be within the scope of this invention. Other variations Will readily occur-in practice. V

I claim: v 1. In a'boiler, the combination of a furnace wall; a series ofspaced water tubes parallel 2 t0 and in proximity to the wall; a superheater betweenthe water tubes and the wall; and a partition of adjustable size between thewater tubes and the superheater, whereby the amount ofthe superheater surface exposed to radiant heat, and therefore the degreeof superheat, can be adjusted. w

2. In a boiler the combination of a furnace wall; .a plurality of spaced alinedver- 'tical water tubes parallel to and in proximity to the Wall; a plurality of alined superheater tubes parallel to the water tubes and between them. and the wall; and a partition comprising separate heat-resisting blocks between the water tubes and the superheater tubes and I supported laterally bythem; the extent of said partition, and therefore the degree of superheat, being adjustable.

3. In a boiler the combination of a furnace wall;a plurality of spaced, alined, Vertical 0 water tubes parallel to and in proximity to the wall; a plurality of'alined superheater tubes parallel to the Water tubes and between them and the wall; and a partition extending upward from the lower ends of the superheater tubes between them and the water tubes and supported laterally by them; the

- f height of said partition and therefore the degree of superheat being readily adjustable.

4. In'apparatus of the, class described, the

7 combination of a boiler; a furnace under the boiler; walls enclosing them; a row of spaced vertical Water tubes parallel to and near one of the'walls; a superheater comprising top and bottom headers outside of the furnace and parallel to the last-named wall, and tubular' vertical elements betweenthe said Wall and said Water tubes, their ends bent toward f and connected to the headers; a wall between the'superheater elements andthe water tubes, shielding the elements from radiant heat from the furnace; the heightfof said wall and therefore thedegree of 'superheat being adjustable; and a support secured tothe fur- T I nac'e wall to support said adjustable'wall.

- e m ERNEST-G. KEITHLEY. 

